為實現2050淨零排放，國際能源署（IEA）於2021年發布《2050淨零路徑》報告，強調建築部門應發展高能效、低碳化建築，並提出2030年所有新建建築達到近零碳標準、2040年50%既有建築完成低碳改造、2050年85%既有建築符合近零碳標準的目標。我國依循國際趨勢，國家發展委員會於2022年發布《台灣2050淨零路徑》，其中包含推動建築產業邁向淨零排放，分析建築能耗影響因子與建築節能技術，加速建築產業邁向低碳永續發展。
建築在生命週期中的碳排放主要可分「使用碳排」與「蘊含碳排」，前者來自營運階段，後者涵蓋建築材料、施工及拆除等影響。為精準評估建築碳排放，我國依據EN15978標準，推動建築能效評估手冊（BERS）以評估使用碳排，並發布低碳低蘊含碳建築評估手冊（LEBR）以評估蘊含碳排。這兩本手冊為建築師與建築生命週期評估LCA專業人員提供依據，協助建築碳排評估、低碳設計決策，並促進建築產業邁向淨零目標，兩者合併則為建築的全生命週期影響。
建築設計初期是後續建築變更時影響最大的關鍵因素，對此本研究開發一套針對早期建築階段使用的碳排評估工具，協助初期導入永續技術，透過物件導向的BIM環境，將BIM與LCA評估整合進該設計軟體中，藉由參數化的方式進行自動化計算， 該系統在建築設計初期過程中逐步導入低碳評估決策，協助設計師在早期建築設計規劃時，給予低碳建議，使用者可藉由此碳排結果逐步對量體進行修正，此過程是輔助設計師進行低碳建築的應用，並透過視覺化的方式，將低碳策略從建築設計的初期同步輔助設計師進行操作，以此達到減碳新技術的推廣應用。

To address the global target of achieving net-zero emissions by 2050, the building sector plays a critical role in reducing both operational and embodied carbon emissions throughout the building life cycle. Although existing assessment frameworks provide standardized methods, their application is often constrained in early design stages due to limited design information and workflow inefficiencies.
This research develops a BIM-integrated decision-support system for early-stage architectural design with automated carbon performance visualization. The proposed system, named BIMAC (BIM-Integrated Auto-Carbon Decision-Support System), integrates Building Information Modeling (BIM) and life-cycle assessment (LCA) within an object-oriented and parametric design environment. The Low-Embodied Carbon Building Evaluation Manual (LEBR) and Taiwan’s building component carbon database (B-LCC) serve as the foundation for embodied carbon assessment.
The BIMAC system is structured around three evaluation stages corresponding to different levels of design development:
• Pre-LOD (Pre-Design Stage):
Carbon emission ranges are estimated based on building massing parameters and initial assumptions to support rapid comparison of design scenarios.
• LOD 100 (Concept Design Stage):
Carbon impacts are evaluated by incorporating structural systems and major construction types, enabling designers to identify carbon hotspots and performance trends.
• LOD 200 (Schematic Design Stage):
More detailed material and component information is introduced to quantify embodied carbon with increased accuracy and to support refined design decisions.
The system is implemented through parametric programming using Dynamo and Python, embedding carbon assessment formulas directly into the BIM environment. By providing automated calculations and visual feedback, BIMAC enables designers to compare, adjust, and optimize design alternatives at early stages, explicitly integrating carbon performance as a design criterion. Overall, the proposed system enhances early-stage carbon assessment efficiency, reduces design uncertainty, and supports informed low-carbon decision-making, contributing to the advancement of net-zero building practices.

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